Harden not your heart, as in the provocation, and as in the day of trials in the wilderness:
All Commentaries on Psalms 95:8 Go To Psalms 95
Augustine of Hippo
AD 430
10. Therefore, "To-day if ye will hear His voice, harden not your hearts" (ver. 8). O my people, the people of God! God addresses His people: not only the people of His which He shall not cast off, but also all His people. For He speaketh in the corner stone to each wall: that is, prophecy speaketh in Christ, both to the people of the Jews, and the people of the Gentiles. For some time ye heard His voice through Moses, and hardened your hearts. He then, when you hardened your hearts, spoke through a herald; He now speaketh by Himself, let your hearts soften. He who used to send heralds before Him, hath now deigned to come Himself; He here speaketh by His own mouth, He who used to speak by the mouths of the Prophets.